In 2020, Matthew Dolloff, an unlicensed security guard contracted through Pinkerton, shot and killed Lee Keltner, a conservative protester, in Denver, Colorado. Dolloff had been contracted by Pinkerton to guard a camera-crew working for 9News. The camera crew had been assigned to cover rival political groups protesting in Denver. Keltner had told a cameraman to stop filming him; Dolloff then approached Keltner. Keltner slapped Dolloff before spraying him with bear spray, and moments later Dolloff shot Keltner. Dolloff was arrested, investigated for first-degree murder, and charged with second-degree murder. The charge was later dropped

I'm mandela'd on this one, I thought he wasn't actively employed as a pinkerton at the time, and that he got killed in a shoot-out at a house with the pigs a day or two later, I'm probably conflating it with another event from around then if anyone knows anything that would fit?